fc131e926d
* Remove static cfg values from GUI cache. Theres no need for these values to be copied into the cache when templates could simply access the config struct directly. This also changes the cache accessor so it returns a copy of the cache rather than a pointer, which removes a potential race. * Rename and move cache. Cache code was previous in `homepage.go`, but its used in multiple places and not just on the homepage. Its enough code to go into its own dedicated `cache.go`.
87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
// Copyright (c) 2020-2021 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package webapi
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import (
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"context"
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"encoding/base64"
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"sync"
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"time"
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"github.com/decred/dcrd/chaincfg/v3"
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"github.com/decred/vspd/database"
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"github.com/decred/vspd/rpc"
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)
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// apiCache is used to cache values which are commonly used by the API, so
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// repeated web requests don't repeatedly trigger DB or RPC calls.
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type apiCache struct {
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UpdateTime string
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PubKey string
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Voting int64
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Voted int64
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Revoked int64
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BlockHeight uint32
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NetworkProportion float32
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RevokedProportion float32
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}
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var cacheMtx sync.RWMutex
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var cache apiCache
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func getCache() apiCache {
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cacheMtx.RLock()
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defer cacheMtx.RUnlock()
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return cache
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}
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// initCache creates the struct which holds the cached VSP stats, and
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// initializes it with static values.
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func initCache() {
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cacheMtx.Lock()
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defer cacheMtx.Unlock()
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cache = apiCache{
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PubKey: base64.StdEncoding.EncodeToString(signPubKey),
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}
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}
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// updateCache updates the dynamic values in the cache (ticket counts and best
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// block height).
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func updateCache(ctx context.Context, db *database.VspDatabase,
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dcrd rpc.DcrdConnect, netParams *chaincfg.Params) error {
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// Get latest counts of voting, voted and revoked tickets.
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voting, voted, revoked, err := db.CountTickets()
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if err != nil {
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return err
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}
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// Get latest best block height.
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dcrdClient, err := dcrd.Client(ctx, netParams)
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if err != nil {
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return err
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}
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bestBlock, err := dcrdClient.GetBestBlockHeader()
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if err != nil {
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return err
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}
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cacheMtx.Lock()
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defer cacheMtx.Unlock()
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cache.UpdateTime = dateTime(time.Now().Unix())
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cache.Voting = voting
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cache.Voted = voted
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cache.Revoked = revoked
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cache.BlockHeight = bestBlock.Height
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cache.NetworkProportion = float32(voting) / float32(bestBlock.PoolSize)
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cache.RevokedProportion = float32(revoked) / float32(voted)
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return nil
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}
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